Simulation Study on Performance of Z-path Moving-fluidized Bed for Gaseous Reduction of Iron Ore Fines

Tang, Huajie; Guo, Zhen; Kitagawa, Kuniyuki

doi:10.2355/isijinternational.52.1241

Cited by 14 publications

(2 citation statements)

References 15 publications

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“…Generally, shrink unreacted core model is consistent with the step-wise of iron oxides. As the hematite particles are very small, the reactions that are given by Equations (1)-(3) were considered to proceed independently [34]. Their reduction rates were thus described using a one-interface unreacted shrinking core model, as Equation (19).…”

Section: Determination Of Model Parameters and Reaction Rates Of Invomentioning

confidence: 99%

Modeling and Experimental Study of Ore-Carbon Briquette Reduction under CO–CO2 Atmosphere

Tang

Yun

et al. 2018

Metals

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Iron ore-carbon briquette is often used as the feed material in the production of sponge iron via coal-based direct reduction processes. In this article, an experimental and simulation study on the reduction behavior of a briquette that is made by hematite and devolatilized biochar fines under CO-CO 2 atmosphere was carried out. The reaction model was validated against the corresponding experimental measurements and observations. Modeling predictions and experimental results indicated that the CO-CO 2 atmosphere significantly influences the final reduction degree of the briquette. Increasing the reduction temperature did not increase the final reduction degree but was shown to increase the carbon that was consumed by the oxidative atmosphere. The influence of the CO-CO 2 atmosphere on the briquette reduction behavior was found to be insignificant in the early stage but became considerable in the later stage; near the time of the briquette reaching its maximum reduction degree, both iron oxide reduction and metallic iron re-oxidation were able to occur.

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Section: Determination Of Model Parameters and Reaction Rates Of Invomentioning

confidence: 99%

Modeling and Experimental Study of Ore-Carbon Briquette Reduction under CO–CO2 Atmosphere

Tang

Yun

et al. 2018

Metals

Self Cite

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“…However, most of the ore deposits in China are either refractory or of low-quality grade. 3,4 For example, the primary iron ore deposit in Huimin, Yunnan, China, is an enormous, potentially valuable natural resource. Conservative estimates indicate that the deposit contains 16 billion tonnes of siderite ore, which accounts for 40% of the total siderite resources in China.…”

Section: Introductionmentioning

confidence: 99%

Removal of harmful elements and sodium carbonate reinforced carbothermic reduction of siderite ore with high phosphorus and sulphur content

Bai

Wen

et al. 2013

Ironmaking & Steelmaking

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is characterised by high phosphorus and sulphur content. In this study, the beneficiation of this iron ore by carbothermic reduction and by a combined dressing-metallurgy process that included reverse flotation, sodium carbonate reinforced carbothermic reduction and magnetic separation were investigated. In the carbothermic reduction process, pyrite was converted to iron sulphide (FeS) and phosphorus compounds remained as fluorapatite in the gangue phases. These compounds lead to excess phosphorus and sulphur concentrations in the iron concentrate. Therefore, the removal of the phosphorus and sulphur from raw ore by reverse flotation prior to the reduction process was necessary. The use of Na 2 CO 3 as a pulp pH modifier proved important for the non-synchronous removal of sulphur and phosphorus. Reduced ore produced without a Na 2 CO 3 additive to the reduction process had iron particulates of small size (,10 mm) and an abundance of fayalite components. The formation of fayalite in the reduction process appeared to be the main hindrance to the reduction of siderite. When Na 2 CO 3 was added to the reduction process to ore mass ratio of 5% after sulphur and phosphorus removal, the reduction of siderite was reinforced. After the grinding and magnetic separation process, an iron concentrate with 65?85% Fe was obtained. The iron concentrate also had a decreased content of phosphorus (0?21%) and sulphur (0?28%) and can be served as raw material in ironmaking.

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A Simplified Bubble Size Relation Compatible with the Energy Minimization Multiscale Drag Model for Studying Hydrodynamics in a 2D Gas–Solid Tapered Fluidized Bed

Sahoo,

Sarkar

2024

steel research int.

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Gas–solid fluidized bed reactors are extensively utilized in direct reduced iron production. In practice, these reactors will have a wide particle size distribution, which is better handled by tapered fluidized beds due to their vertical velocity gradient. Herein, a simplified bubble size relation is proposed to remove implicit interdependency between the bubble size and its drag coefficient in the bubble‐based energy minimization multiscale (EMMS) heterogeneous drag model. Further, the proposed drag model is coupled with the two‐fluid kinetic theory of granular flow model to investigate hydrodynamics. The heterogeneous flow structure predicted by the model is similar to experiments. Further, the bulk parameters such as bed expansion ratio and bubble fraction obtained from the simulations using a simplified EMMS drag model are compared and are found to be in good agreement with the experimental findings, with mean relative deviations of 3.95% and 14.64%, respectively. The time‐averaged bubble fraction and bed expansion ratio are found to increase with air velocity and decrease with taper angle, whereas a reverse trend is observed for the mean particulate fluidized area fraction. Based on the current study, the taper angle between 5° and 10° is found to be most suitable.

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Simulation Study on Performance of Z-path Moving-fluidized Bed for Gaseous Reduction of Iron Ore Fines

Cited by 14 publications

References 15 publications

Modeling and Experimental Study of Ore-Carbon Briquette Reduction under CO–CO2 Atmosphere

Modeling and Experimental Study of Ore-Carbon Briquette Reduction under CO–CO2 Atmosphere

Removal of harmful elements and sodium carbonate reinforced carbothermic reduction of siderite ore with high phosphorus and sulphur content

A Simplified Bubble Size Relation Compatible with the Energy Minimization Multiscale Drag Model for Studying Hydrodynamics in a 2D Gas–Solid Tapered Fluidized Bed

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